Door-lock



DOOR LOCK.

Patented NOV. 15, 1921..

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William S- Br'ainard.

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W. S. BRAINARD.

APPLICATION FILED MAY 8, 1920.

WILLIAM S. IBRAINARD, OF ROCHESTER, NEW HAMPSHIRE, ASSIGNOR OF r Fries;

ONE-HALF TO JOHN L. MEADER, OF GONIC, NEW HAMFSHIRE.

DOOR-LOCK.

Specification of Letters Patent.

l' atented Nov. 15, 192i Application filed May 8, 1920. Serial No. 379,766.

To all whom it may concern:

Pie it known that I, VVILL'IAM S. BRAINARD,

a citizen of the United States, residing at Rochester, county of Strafi'ord, State of New Hampshire, have invented an l mprovement in Door-Locks, of which the following description, in connection with the accompanying drawing, is a speoificatlon, like characters on the drawing representing like parts.

This invention relates to door locks and particularly to that type of lock which is associated with the door knob and which is operative to lock the door knob from turning movement.

One of the objects of the invention is to provide an improved lock of this nature which can be readily applied to any door knob without necessitating any change in the structure thereof, and another object of the invention is to provide an improved door lock of this type which is simple in its structure and easily manufactured, and which will operate to securely lock the door.

' Other objects of the invention are to improve door locks of this type, all as will be more fully hereinafter set forth.

In order to give an understanding of my invention, I have illustrated in the drawings a selected embodiment thereof which will now be described, after which the novel features thereof will be pointed out in the appended claim.

In the drawings, Figure 1 is a sectional perspective view showing my improved lock applied to the door knob of a door;

F 2 is a perspective view showing the lock removed from the door knob;

l' ig. 3 is a plan view of Fig. 1.

In the drawings 1 indicates a portion of a door to which is applied the usual door knob 2, the latter having a shank portion 3 which fits over the knob spindle 4, as usual in door knob structures. 5 indicates the washer or rosette which is screwed to the door by suitable screws 6.

The parts thus far described are or may be all as usual in door knobs and constitute no part of my present invention.

My improved lock comprises a bolt-hold ing element 7 which is adapted to be secured to the knob shank 3, and a bolt 8 'slidably mounted in said element and adapted to lalve interlocking engagement with the vasher or rosette 5. This bolt-holding ele ment 7 may be constructed in various ways without departing from the invention. but 1 will preferably make it so that it can be readily applied to the knob without involv- 111;; any change in the knob structure. It is herein shown in the form of a split sleeve having the ears 18 to receive a clamping screw 9 by which it is clamped to the knob shank. This clamping screw 9 extends through one ear and has screw-threaded engagement with the other ear, so that by tightening the screw, the sleeve 7 will be firmly and rigidly clamped to the shank 3. This element 7 is formed with a boss or extension 10 in which the bolt 8 is slidably mounted. Said bolt extends parallel to the shank 3 but is situated entirely exterior thereof. The boss 10 is formed with a cam slot 11 and the bolt 8 is provided with an arm 12 which extends laterally through this cam slot 11. This arm 12 may conveniently be provided at its end with a knob or fingerpiece 13. With this construction the swinging of the handle 12 from one side to the other of the boss 10 will operate to move the bolt in the direction of its length.

The washer or rosette 5 is provided with an aperture 14 to receive the bolt 8 when the latter is thrown forwardly into locking position, and the length of the bolt and the position of the bolt-holding element are such that when the arm 12 is thrown into the full line position, F igs. 1 and 3, the bolt will be moved forwardly into the aperture 14., while when said arm is thrown into the dotted line position, Fig. 3, the bolt will be entirely withdrawn from the aperture 14. The dotted line position shows the unlocked position, and when the parts are in this position, the knob is unlocked and is free to be turned. To lock the door it is simply necessary to throw the arm 12 from the dotted to the full line position, Fig. 3, such movement operating to move the bolt 8 forwardly into the aperture 14. Since the member 7 is rigidly clamped to the knob, the entering of the bolt into the aperture 14 will firmly lock the knob from turning movement and thereby lock the door.

In applying my device to a door, it is simply necessary to remove the knob from the shaft 1 in usual way and apply the bolt-holding element 7 to the shank 3, and

then replace the knob on the shaft again. The Washer 5 will, of course, have to be provided With a suitable aperture 14. Before the bolt-holdingelement 7 is firmly clamped in position it will be so adjusted on the knob of the shank 3 that the bolt Will stand opposite the aperture 14 in the Washer 5 when the knob is in its normal position with the latch 15 of the door projected. After this adjustment has been made the clamping screw 9 is tightened thereby rigidly clamping the bolt-holding element to the knob shank. After the parts have thus been secured to the knob the operation of locking the door involves merely that of swinging the handle 12 from the dotted to the full line position Fig. 3.

The device is simple and can be easily applied to any door knob and it is so constructed that it does not necessitate any special construction of knob and involves only the employment of an aperture 14 in the usual washer 5.

I claim:

Ina door lock, the combination with a door knob having a shank and a Washer or rosette secured to the door and provided With a bolt-receiving aperture, of a split sleeve encircling the door knob shank. and clamped thereto said sleeve having on its exterior a boss provided With a bolt-receiving aperture extending parallel to said shank but spaced therefrom, and also having a cam slot communicating With the aperture, a bolt slidably mounted in said bolt-receiving aperture and adapted to enter the aperture in the Washer, and an arm rigid With the bolt extending through the cam slot and by Which the bolt is operated.

In testimony whereof, I have signed my name to this specification.

XVILLIAM S. BRAINARD. 

